BlockFactory.php

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<?php
namespace Magento\Framework\View\Element;

use Magento\Framework\ObjectManagerInterface;

class BlockFactory
{
    protected $objectManager;

    public function __construct(ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function createBlock($blockName, array $arguments = [])
    {
        $blockName = ltrim($blockName, '\\');
        $block = $this->objectManager->create($blockName, $arguments);
        if (!$block instanceof BlockInterface) {
            throw new \LogicException($blockName . ' does not implement BlockInterface');
        }
        if ($block instanceof Template) {
            $block->setTemplateContext($block);
        }
        return $block;
    }
}